Adjustable holster



FIG. 1 is a perspective view of an adjustable holster showing our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a right-side side view thereof; and,

FIG. 7 is a left-side side view thereof. 

The ornamental design for an adjustable holster, as shown. 